Compound A has molecular formula C9H20. Compound A produces exactly three constitutional isomers upon monochlorination, and one major constitutional isomer upon monobromination. Which of the following are possible structures of compound A? 
Definitions:
Schizophrenia
An emotional and cognitive disorder where thought, sensory understanding, feelings, and social behavior are impaired.
Cortical Seizure
A seizure originating in the brain's cortex, affecting consciousness and motor or sensory functions depending on the area involved.
Mood Swings
Rapid fluctuations in a person's emotional state, often experienced as intense, frequent changes in mood.
Bipolar Disorder
A mental disorder marked by dramatic shifts in a person's mood, energy, and ability to think clearly, ranging from manic highs to depressive lows.
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